elf-init.c

/* Startup support for ELF initializers/finalizers in the main executable. Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. In addition to the permissions in the GNU Lesser General Public License, the Free Software Foundation gives you unlimited permission to link the compiled version of this file with other programs, and to distribute those programs without any restriction coming from the use of this file. (The GNU Lesser General Public License restrictions do apply in other respects; for example, they cover modification of the file, and distribution when not linked into another program.) Note that people who make modified versions of this file are not obligated to grant this special exception for their modified versions; it is their choice whether to do so. The GNU Lesser General Public License gives permission to release a modified version without this exception; this exception also makes it possible to release a modified version which carries forward this exception. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */#include <stddef.h>/* These magic symbols are provided by the linker. */extern void (*__preinit_array_start []) (int, char **, char **)
attribute_hidden;
extern void (*__preinit_array_end []) (int, char **, char **)
attribute_hidden;
extern void (*__init_array_start []) (int, char **, char **)
attribute_hidden;
extern void (*__init_array_end []) (int, char **, char **)
attribute_hidden;
extern void (*__fini_array_start []) (void) attribute_hidden;
extern void (*__fini_array_end []) (void) attribute_hidden;
/* These function symbols are provided for the .init/.fini section entry points automagically by the linker. */externvoid _init (void);
externvoid _fini (void);
/* These functions are passed to __libc_start_main by the startup code. These get statically linked into each program. For dynamically linked programs, this module will come from libc_nonshared.a and differs from the libc.a module in that it doesn't call the preinit array. */void
__libc_csu_init (int argc, char **argv, char **envp)
{
/* For dynamically linked executables the preinit array is executed by the dynamic linker (before initializing any shared object. */#ifndef LIBC_NONSHARED/* For static executables, preinit happens rights before init. */
{
constsize_t size = __preinit_array_end - __preinit_array_start;
size_t i;
for (i = 0; i < size; i++)
(*__preinit_array_start [i]) (argc, argv, envp);
}
#endif
_init ();
constsize_t size = __init_array_end - __init_array_start;
for (size_t i = 0; i < size; i++)
(*__init_array_start [i]) (argc, argv, envp);
}
/* This function should not be used anymore. We run the executable's destructor now just like any other. We cannot remove the function, though. */void
__libc_csu_fini (void)
{
#ifndef LIBC_NONSHAREDsize_t i = __fini_array_end - __fini_array_start;
while (i-- > 0)
(*__fini_array_start [i]) ();
_fini ();
#endif}